we also stayed in Las Vegas last April. the weather was not too hot and quite comfortable. Think this is the best time.After April it gets very hot and even in September the heat is very over powering. Dont go around january/feb or march as then it can be cold.
New Year is good - great fireworks from one hotel to another all along the strip and terrific sales in the shops. Days are about mid 50's and very sunny from early morning on but as it is desert country it dips down very cold at night.
Summer temps go well over 40 degrees and get unbearable.
Hi, we were in Las Vegas in February and the weather was OK. It was around 16 degrees all the time - so we needed a jacket or a jumper but we prefer this weather to 40 degrees. We are planning to go next year in April, so hopefully it will be little bit warmer.